OBDZON.com provides 100% original products and lifetime free tech support. Heavy duty scanners is mainly used in diesel vehicles to collect, store and transmit information about diesel vehicle conditions and engine emissions. The Ancel X7HD and Ancel HD series are the most representative of all the heavy truck diagnostics scanners on the market. The ANCEL HD3600/HD3500/HD3400 is the latest model in 2022 and will be more comprehensive.